"When we made the comparison between the size of the offspring generation and the population before selection, we found a measured, evolutionary response had taken place and it was almost identical to what we had predicted." Show Darwin thought that evolution took place over hundreds or thousands of years and was impossible to witness in a human lifetime. Peter and Rosemary Grant have seen evolution happen over the course of just two years. The Grants study the evolution of Darwin's finches on the Galapagos Islands. The birds have been named for Darwin, in part, because he later theorized that the 13 distinct species were all descendants of a common ancestor. Each species eats a different type of food and has unique characteristics developed through evolution. For example, the cactus finch has a long beak that reaches into blossoms, the ground finch has a short beak adapted for eating seeds buried under the soil, and the tree finch has a parrot-shaped beak suited for stripping bark to find insects. The Grants have focused their research on the medium ground finch, Geospiza fortis, on the small island of Daphne Major. Daphne Major serves as an ideal site for research because the finches have few predators or competitors. (The only other finch on the island is the cactus finch.) The major factor influencing survival of the medium ground finch is the weather, and thus the availability of food. The medium ground finch has a stubby beak and eats mostly seeds. Medium ground finches are variable in size and shape, which makes them a good subject for a study of evolution. The first event that the Grants saw affect the food supply was a drought that occurred in 1977. For 551 days the islands received no rain. Plants withered and finches grew hungry. The tiny seeds the medium ground finches were accustomed to eating grew scarce. Medium ground finches with larger beaks could take advantage of alternate food sources because they could crack open larger seeds. The smaller-beaked birds couldn't do this, so they died of starvation. In 1978 the Grants returned to Daphne Major to document the effect of the drought on the next generation of medium ground finches. They measured the offspring and compared their beak size to that of the previous (pre-drought) generations. They found the offsprings' beaks to be 3 to 4% larger than their grandparents'. The Grants had documented natural selection in action. While beak size is clearly related to feeding strategies, it is also related to reproduction. Female finches tend to mate with males that have the same size beaks. These factors together can add to the development of new species. The Grants return each year to Daphne Major to observe and measure finches. They have been collecting data on the finches for over 25 years and have witnessed natural selection operating in different ways under different circumstances. NameClassDate16.4Evidence of EvolutionLesson ObjectivesExplain how geologic distribution of species relates to their evolutionary history.Explain how fossils and the fossil record document the descent of modern species fromancient ancestors.Describe what homologous structures and embryology suggest about the process ofevolutionary change.Explain how molecular evidence can be used to trace the process of evolution.Explain the results of the Grants’ investigation of adaptation in Galápagos finches.Lesson SummaryBiogeographyBiogeographyis the study of where organisms live now and where theyand their ancestors lived in the past. Two biogeographical patterns are significant to Darwin’stheory:The first is a pattern in which closely related species differentiate in slightly differentclimates. The Galápagos tortoises and finches follow this pattern.The second is a pattern in which very distantly related species develop similarities insimilar environments. The rheas, ostriches, and emus fall into this pattern.The Age of Earth and FossilsRadioactive dating techniques have confirmed that Earth is ancient—approximately 4.5billion years old.Recent fossil finds document intermediate stages in the evolution of many groupsincluding whales, birds, and mammals.Comparing Anatomy and EmbryologyHomologous structuresare shared by related species and have been inherited from acommon ancestor. Similarities and differences among homologous structures helpdetermine how recently two groups shared a common ancestor. Recommended textbook solutions Glencoe Health1st EditionMcGraw-Hill Education 1,843 solutions Biology1st EditionKenneth R. Miller, Levine 2,470 solutions Miller and Levine Biology1st EditionJoseph S. Levine, Kenneth R. Miller 1,773 solutions Nelson Science Perspectives 91st EditionDoug Fraser, Jeff Major, Maurice DiGiuseppe 1,835 solutions What hypothesis did Grants test?A Testable Hypothesis
Peter and Rosemary Grant from Princeton University realized that Darwin's hypothesis rested on two testable assumptions: For beak size and shape to evolve, there must be enough heritable variation in those traits to provide raw material for natural selection.
What hypothesis have the Grants been testing on the Galapagos Islands?The Grants study the evolution of Darwin's finches on the Galapagos Islands. The birds have been named for Darwin, in part, because he later theorized that the 13 distinct species were all descendants of a common ancestor.
What hypothesis have the Grants been testing quizlet?What hypothesis have the Grants been testing? The hypothesis that the Grants have been testing is about the natural selection shaping the beaks of different bird populations. How do the Grants' data show that genetic variation is important in the survival of a species?
Which of the following scientists on this list was the first to hypothesize that living things change over time?The basic idea of biological evolution is that populations and species of organisms change over time. Today, when we think of evolution, we are likely to link this idea with one specific person: the British naturalist Charles Darwin.
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